Can't remove movie clip?

Me oh my this is irritating… I can’t seem to remove the movie clip referenced by “ghost”. I’ve verified that I’m targeting things correctly because i can change the alpha of ghost with the “onMouseUp” event, but I can’t remove it?!

 _root.compareTable.bizDragger0.onPress = function() {
        ghost = _root.attachMovie("bizTypeDragger", "bizDraggerGhost", _root.getNextHighestDepth());
        with (ghost) {
            _alpha = 40;
            _x = _xmouse-(ghost._width/2);
            _y = _ymouse-(ghost._height/2);
    _root.onMouseUp = function() {
        ghost._alpha = 5;
        ghost.removeMovieClip(); // THIS ISN'T WORKING?